Skimmer pump help
 

I have a PM Bullet 2 skimmer that I am going to use on my new 90g setup. I am trying to figure out what pump to use. I have a Little Giant 4-MDQX-SC that I could use, but would rather not drill another hole into my sump (I already had to drill one for the skimmer drain, it is way too big to fit in my sump/fuge, so it is external). How reliable is it to use "over the top" plumbing so I dont have to drill another hole?
Is there a submersible pump that I could use?
What does RC recommend?
Or should I just go ahead and bite the bullet (pun intended), drill another hole and use the LG pump? I already have a bulkhead that I could use.
Thanks
Joe